修改rag，实现混合检索

tools/test/test_retrievers.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+"""
+测试 app/rag/retriever.py 里的混合检索函数
+"""
+
+import asyncio
+import os
+import sys
+
+project_root = os.path.join(os.path.dirname(__file__), "..", "..")
+sys.path.insert(0, os.path.join(project_root, "backend"))
+
+from app.rag.retriever import create_hybrid_retriever, create_parent_hybrid_retriever
+
+
+def test_hybrid_retriever():
+    """测试混合检索器"""
+    print("="*70)
+    print("测试 HybridRetriever...")
+    print("="*70)
+    
+    retriever = create_hybrid_retriever(collection_name="rag_documents", search_k=3)
+    results = retriever.invoke("黄双银")
+    
+    print(f"\n找到 {len(results)} 个结果\n")
+    for i, doc in enumerate(results):
+        print(f"--- 结果 {i+1} ---")
+        print(doc.page_content[:200])
+        print()
+
+
+def test_parent_hybrid_retriever():
+    """测试父子混合检索器"""
+    print("\n" + "="*70)
+    print("测试 ParentHybridRetriever...")
+    print("="*70)
+    
+    retriever = create_parent_hybrid_retriever(
+        collection_name="rag_documents", 
+        search_k=3,
+        use_docstore=False
+    )
+    results = retriever.invoke("黄双银")
+    
+    print(f"\n找到 {len(results)} 个结果\n")
+    for i, doc in enumerate(results):
+        print(f"--- 结果 {i+1} ---")
+        print(doc.page_content[:300])
+        print()
+
+
+if __name__ == "__main__":
+    test_hybrid_retriever()
+    test_parent_hybrid_retriever()